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43058-B10
Ferro-Antiferromagnetic Exchange Coupled Nanocomposites

Sanjay Mishra, The University of Memphis

Exchanged coupled nanocomposites

The overall research goal of this grant is to understand the magnetic properties of exchange coupled nanocomposites with a vision to enhance their magnetic properties. The main objectives of this research project are to: (1) Explore novel synthesis technique to form exchange coupled magnetic nanocomposite, (2) better understand the magnetic properties of these materials, and (3) involve undergraduate/graduate students in research in the field of magnetic nanomaterials.

����������� After successful synthesis of synthesis of CoFe₂O₄-Fe₃O₄ exchange coupled magnetic nanocomposites using hydrothermal technique, students are working on two major projects viz. (CoFe₂O4)oxide-oxide(CoO/NiO/CuO/MnO) nanocomposites, Figure 1, and La₂O₃ (Y₂O₃/Sm₂O₃)-Fe₂O₃ nanocomposites, Figure 2 (Nugget). To our knowledge there are no reports on oxide-oxide FM-AFM nanocomposite materials prepared via ball milling. The research efforts in the direction of oxide based exchange coupled magnetic nanocomposite is driven by the fact that these composites are relatively light weight and are environmentally stable compared to metal-oxide based exchange coupled magnetic nanocomposites. Thus, these composites may find application in designing light weight magnetic components especially for high temperature and space applications.

During the year 2007-2008 two undergraduate students completed their senior research projects under this grant. One graduate student joined the doctoral program at the University of North Carolina. Two more graduate students are going to join doctoral program at the University of Alabama, and the University of Michigan. Four peer reviewed articles were published with the support of this grant. Papers were presented at the MMM conference and March-APS 2009 meeting. Two more papers will be presented at the IEEE-Intermag in May 2009.

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